<template>
    <div class="tab-bar-item" @click="itemClick">
      <div v-if="!isActive"><slot name="item-icon"></slot></div>
      <div v-else><slot name="item-icon-active"></slot></div>
      <div :style="activeStyle"><slot name="item-text"></slot></div>
    </div>
</template>

<script>
export default {
  name: 'TabBarItem',
  props: {
    path: String,
    activeColor: {
      type: String,
      default: 'red'
    }
  },
  data(){
    return {
    }
  },
  computed: {
    isActive(){
      // 拿当前活跃的route的path和父组件传过来的path比较
      // indexOf  == -1 表示没有找到，!= -1 表示找到
      return this.$route.path.indexOf(this.path) != -1
    },
    activeStyle(){
      // 如果处在活跃状态就给color赋值
      return this.isActive ? {color: this.activeColor} : {}
    }
  },
  methods: {
    itemClick(){
      return this.$router.replace(this.path)
    }
  }
}
</script>

<style>
  .tab-bar-item{
    flex: 1;
    text-align: center;
    height: 49px;
    font-size: 12px;
  }
  .tab-bar-item img{
    width: 24px;
    height: 24px;
    margin-top: 3px;
    vertical-align: middle;
    margin-bottom: 2px;
  }
</style>
